Phase separation Coupled with Gelation in Polyethylene Glycol-Gelatin-Aqueous Buffer System.
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Phase behavior of a pseudoternary system, gelatin–polyethylene glycol–acetate buffer, was examined. Phase diagram was constructed by determining the compositions of separated phases. One phase contained mostly gelatin but a trace amount of polyethylene glycol. When temperature was lower than the gelation temperature corresponding to the composition of the separated phase, diverse outlooks of the whole system were found. Observation of solutions under an optical microscope revealed microgels or network structure when gelatin was labeled with sirius red. Two different types of microgel formation were noted: nucleation-growth and spinodal decomposition. Size of the microgels formed by spinodal decomposition decreased with quench temperature.
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- Phase separation Coupled with Gelation in Polyethylene Glycol-Gelatin-Aqueous Buffer System.